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The Collaborative International Dictionary
Underlease

Underlease \Un"der*lease\, n. (Law) A lease granted by a tenant or lessee; especially, a lease granted by one who is himself a lessee for years, for any fewer or less number of years than he himself holds; a sublease.
--Burrill.

Wiktionary
underlease

n. (context legal English) A lease granted by a tenant or lessee; a sublease.